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Old 16 January 2009, 17:17   #1
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522 diesel filter suitable for petrol??

does anyone know if the crosland 522/cav296 type fuel filters are suitable for petrol?
they are fitted on just about everything british thats diesel, landrover jcb ETC ETC.
I want to use one on the SR but recall someone mentioning the glue in them would be attacked by petrol?
I have seen them on petrols but not sure how sucessful they were!
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Old 16 January 2009, 18:04   #2
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No it is designed as a diesel fuel filter which is quite coarse micron wise,... ok for diesel but It will be not so good for petrol, particularly where an injection system is involved. That said it was usually fitted with a seperator bowl underneath it so it was good for water contamination removal, but for petrol NO!
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Old 16 January 2009, 18:11   #3
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Never had a problem running petrol through a CAV filter and have one on my Opti at the moment.

A previous post on the subject.

http://rib.net/forum/showthread.php?...&highlight=cav

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Old 16 January 2009, 18:23   #4
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Never had a problem running petrol through a CAV filter and have one on my Opti at the moment.

A previous post on the subject.

http://rib.net/forum/showthread.php?...&highlight=cav

Pete
Cant say I had the same experience Pete those Optis are fussy about fuel and how they get it IMO.. petrol injection systems need very clean fuel
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Old 16 January 2009, 20:01   #5
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I've got something similar as a water trap but it's not a CAV-it's got a coarse wire mesh filter in it. I've got a big inline fuel filter before the primer bulb (setup is tank-water trap-bulb-filter-engine though the filter isn't visible in the pic). It works very well indeed.
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Old 17 January 2009, 08:59   #6
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Cant say I had the same experience Pete those Optis are fussy about fuel and how they get it IMO.. petrol injection systems need very clean fuel
Agreed, which is why I use the CAV as a first "course" filter before the fuel gets to the Optis own filter. The glass bowl also means I can see any water build up.

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Old 17 January 2009, 18:42   #7
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What does it take to get some people to agree with you on this forum .. Ok Pete I know you are saying its a primary filter in your case .. but it sure isnt a petrol one,.. you could have a sand bag as your primary filter if you wanted, and rigged it right.

A water seperator or aglomerator is good, but a 522 is a diesel filter.. end of story

*edit* ofcourse it will work but newer engines are ever more particular, so you pays your money and takes your chances. They have to meet ever more strict emissions, and the fuel filtering is a big part in the emissions output. I heard a strory last week that the new tier three diesels will have filters to 3 microns. A human hair is 10 microns so in my industry which is plant hire god knows what that will mean where people fill diggers with diesel from the brickies bucket
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Old 18 January 2009, 10:43   #8
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"Never had a problem running petrol through a CAV filter and have one on my Opti at the moment."


well it getting fitted then! its going on a carb engine as a water separater and a belt and braces in addition to the one in the powerhead,
If it filters fine enough for a diesel then its good enough for a carb engine, which as standard uses a coarse gauze. at the end of the day an injector nozzle is a heck of a lot smaller hole than a yam 90 main jet
my only concern was the guts dissolving in petrol and blocking the filter in the power head. there used to be a petrol filter available for this housing, but it is discontinued.
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Old 18 January 2009, 10:51   #9
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What does it take to get some people to agree with you on this forum .. Ok Pete I know you are saying its a primary filter in your case .. but it sure isnt a petrol one,..
Agreed its a diesel filter and I haven't said otherwise but have said they work with petrol too. I like lots of folk on here just use them for petrol. Been using them since 1997 I think, never had a problem, they just work, filtering fuel.

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A water seperator or aglomerator is good, but a 522 is a diesel filter.. end of story
and your point is? why not have both, the glass bowl sorts the water and the course filter stops nasty stuff reaching the engine.

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*edit* of course it will work
Oh good at least we agree on that.


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but newer engines are ever more particular, so you pays your money and takes your chances. They have to meet ever more strict emissions, and the fuel filtering is a big part in the emissions output.
Couldn't agree more which is why we have a CAV filter first then the Optimax filter mounted in the engine. When I was using older carb engines I used the CAV filter on its own, but the Opti has its own cannister filter inside the engine so the fuel is filtered twice. So what exactly is your problem with my set up ? are you aware that an Opti has a full canister fuel filter inside the engine cover rather than the normal small plastic filter you may have on your Honda.

So in essence what does it take to get some people to agree with you on this forum? well I don't remember not agreeing with you. There is a cost element that is worth considering with this issue too. Price up a 522 filter from any cheap motor factors then ask you Merc/Mariner dealer how much an opti filter is. You don't want to change the opti filter more than necessary but a job lot of 522s are less than 3 each.

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Old 18 January 2009, 10:58   #10
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I remembered Coopers filters used to be in Abergavenny where i grew up and i knew someone who worked there.
definitive answer,
though Primarily designed for derv the filters are suitable for all fuels oils and spirits and filter down to better than 5um-7um.
so plenty good enough for a carb engine water separator,

At last i get to use a bit of Landrover on the SR
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